Paper binder



FIG. 1 is a perspective view of a paper binder in a closed position showing my new design;

FIG. 2 is a side view thereof;

FIG. 3 is a top prospective view thereof, showing the paper binder in the open position;

FIG. 4 is a top plan view thereof in the open position; and,

FIG. 5 is a bottom view thereof in the open position. 

CLAIM The ornamental design for a paper binder, as shown and described. 